Error Code 3 Flashes

Amana AMSS920803BN Error Code 3 Flashes: 3 Flashes

TL;DR

Pressure switch circuit not closed. Induced draft blower is operating.

Disclaimer

This article is for informational purposes only and does not guarantee the accuracy or completeness of the information provided. Always turn off power and gas supply before attempting any repairs. If you smell gas, leave immediately and call your gas company. Consult a licensed HVAC technician for diagnosis and repair. Any actions taken based on this information are at your own risk.

What Does Code 3 Flashes Mean?

Pressure switch circuit not closed. Induced draft blower is operating.

Common Causes

Cause	Likelihood	DIY?
Pressure switch hose blocked, pinched, or connected improperly	Most common	✗ Call a pro →
Blocked flue and/or inlet air pipe, blocked drain system, or weak induced draft blower	Common	✗ Call a pro →
Incorrect pressure switch setpoint or malfunctioning switch contacts	Common	✗ Call a pro →
Loose or improperly connected wiring	Uncommon	✗ Call a pro →

When to Call a Professional

Contact a licensed HVAC technician if:

Basic troubleshooting did not resolve the error
You smell gas at any point during the process
You are not comfortable working around gas lines or electrical components
The unit needs a gas valve, control board, or motor replacement

Sources

Service Instructions - GMSS9*/GCSS9*/AMSS9*/ACSS9* Single Stage Gas Furnaces and Accessories